all: remove unnecessary IError() casts

vlib/crypto/rand/rand_darwin.c.v

@@ -15,7 +15,7 @@ pub fn read(bytes_needed int) ![]u8 {
 	mut buffer := []u8{len: bytes_needed}
 	status := C.SecRandomCopyBytes(C.SecRandomRef(0), bytes_needed, buffer.data)
 	if status != 0 {
-		return IError(&ReadError{})
+		return &ReadError{}
 	}
 	return buffer
 }

vlib/crypto/rand/rand_linux.c.v

@@ -24,7 +24,7 @@ pub fn read(bytes_needed int) ![]u8 {
 		rbytes := unsafe { getrandom(batch_size, buffer + bytes_read) }
 		if rbytes == -1 {
 			unsafe { free(buffer) }
-			return IError(&ReadError{})
+			return &ReadError{}
 		}
 		bytes_read += rbytes
 	}

vlib/crypto/rand/rand_solaris.c.v

@@ -27,7 +27,7 @@ pub fn read(bytes_needed int) ![]u8 {
 		rbytes := unsafe { getrandom(batch_size, buffer + bytes_read) }
 		if rbytes == -1 {
 			unsafe { free(buffer) }
-			return IError(&ReadError{})
+			return &ReadError{}
 		}
 		bytes_read += rbytes
 	}

vlib/crypto/rand/rand_windows.c.v

@@ -19,7 +19,7 @@ pub fn read(bytes_needed int) ![]u8 {
 	// use bcrypt_use_system_preferred_rng because we passed null as algo
 	status := C.BCryptGenRandom(0, buffer.data, bytes_needed, rand.bcrypt_use_system_preferred_rng)
 	if status != rand.status_success {
-		return IError(&ReadError{})
+		return &ReadError{}
 	}
 	return buffer
 }